/*
 * Copyright 2002-2014 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package ameba.websocket;

import java.nio.ByteBuffer;

/**
 * A WebSocket pong message.
 *
 * @author Rossen Stoyanchev
 * @author icode
 *
 */
public final class PongMessage extends AbstractWebSocketMessage<ByteBuffer> {

    /**
     * Create a new pong message with an empty payload.
     */
    public PongMessage() {
        super(ByteBuffer.allocate(0));
    }

    /**
     * Create a new pong message with the given ByteBuffer payload.
     *
     * @param payload the non-null payload
     */
    public PongMessage(ByteBuffer payload) {
        super(payload);
    }


    /**
     * {@inheritDoc}
     */
    @Override
    public int getPayloadLength() {
        return (getPayload() != null ? getPayload().remaining() : 0);
    }

    /** {@inheritDoc} */
    @Override
    protected String toStringPayload() {
        return (getPayload() != null ? getPayload().toString() : null);
    }

}
